Typewriting machine



July 11', 1933. A. G. F. KuRowsKl 1,917,943

TYPEWRITING MACHINE Filed Deo. 30. 1926 Patented July11, 1933 ALFEED G.F. KUROWSKI, 0F BROOKLYN, NEW

FISHER COMPANY, 0F NEW YORK,

YORK, ASSIGNOR TO UNDERWOOD ELLIOTT N. Y., A CORPORATION 0F DELAWARETYPEWBIYTING MACHINE Application led December 30, 1926. Serial No.157,912.

This invention relates to a platen-sweep for quickly and accuratelyfeeding worksheets into a typewriting machine, and positioning the firstline thereon at the typing position of the platen. y

The present invention may be regarded as an improvement on theconstruction of m pending application filed June 28, -1926, Serial No.118,996 (now Patent No. 1,752,491, dated April l, 1930), where alever-actuated platen-rotating mechanismor platen-sweep mechanism isassembled at the right-hand end of the carriage and connected to theplaten-shaft, whereby a comparatively short sweep of the lever willrotate the platen and work-sheet forwardly a predetermined extent. Thus,by a continuous sweeping movement of the hand, the insertion of a work--sheet, having a printed or otherwise spacedoff heading and a fixedprinting position for the first-line entry, may be quickly accomplishedwith mechanical accuracy and without taxing the mind of the operatorfurther ,than to properly position the sheet at the rear of the platen.

With a platen-sweeping mechanism of this character it is essential thatthe teeth of the ratchet-wheel be accurately timed to the teeth of theline-spaced wheel. The Underwood typewriting machine employs aplatenreleasing spacing mechanism at the left-hand end of the platenoperative through clutchmembers to connect or disconnect the linespacewheel to the platen-shaft fixed to the platen. When the clutch-membersare released, the line-space wheel is held by its detent-roller, and itwill be understood, that, Where the platen-sweeping mechanism isassembled at one end of the platen-frame and the platen-releasingmechanism at the opposite end of the platen-frame, the shifting of theplaten, when released from the linespace wheel, will throw the teeth ofthe platen-sweeping ratchet-wheel, fixed to the platen-shaft, out ofregistry with the teeth of the line-spaced wheel, and irregularlinespacing will result through the action of the detent-roller upon theline-space wheel and platen when the clutch-members are restored. Hence,after lany typing operation requiring a fractional setting of thelinespace position of the work-sheet, it is necessary to first retimethe two ratchet-members at opposite ends of the platen to operate inunison, which is a difficult adjustment for the untrained operator. Bythe sheet-inserting mechanism employed upon the Underwood typewriter,the work-sheets are to be swept around the platen by means of a longhandle, which is connected by movement-multiplying means to drive apinion which is fixed upon the shaft upon which the platen is alsofixed. The handle has a pawl, whereby a ratchetwheel is driven, and themovement-multiplying train drives the platen at higher'speed, but to anexact predetermined extent at every stroke. The line-space wheel hasteeth whose angular pitch is as much greater than the pitch of saidratchet-wheel teeth as the angular speed of the one is greater than thespeed of the other. The handlestops, the pawl, the ratchet, themovementmultiplying train and the line-space wheel are all co-ordinated,so that the strokes of the platen shall be exactly uniform.

A feature of the present invention is provision for effecting minuterotative readJustments of the platen, at will, relatively to theplaten-sweep mechanism, without disordering the co-ordinated .parts andtherefore without diminishing the accuracy with which the work-sheet isbrought to its printing position.

'o carry out my invention, the drive-lever an position near theright-hand end of the platen, and may drive a clutch-drum at the ltstrain may be taken out of its usual left-hand end of the platen. Theentire driving train therefore will vremain stationary during therotative readjustment of the platen, effected while the clutch isreleased. No disturbance of the position or operation of thesheet-inserting mechanism therefore v arises through rotativereadjustment of the platen relatively to the movement-multiplyingdrive-wheel, but the operation of the platen-sweep mechanism upon the.platen is exact at all readjustments of the platen relatively to thedrive-wheel.

Preferably the same clutch-drum is con.- nected to both theplaten-driving pinion and the line-space wheel, thereby economizingspace, weight and cost, and` also adapting the invention to use withparts of the standard Underwood mechanism for clutching the platen tothe line-space wheel.

One feature of t e resent invention includes the assembly o a combinedplatensweeping and platen-clutching mechanism upon the same end of theplaten, the toothed ratchet-wheels of the platen-sweeping and theline-spacing being permanently timed and both wheels connectible to theplaten-shaft through the clutch-mechanism. When a work-sheet re uires afractional spacing of a line, the p aten may be independently rotated byits finger-wheels, and the usual detent-roller, by engaging theline-space-wheel teeth, holds the platensweeping ratchet stationaryuntil the platenclutch is restored. This combining of. the twoplaten-rotating mechanisms, especially by placing them at the same endof the platen, permits that the platen may be operated independently ofthe platen-sweep without getting out of registry therewith, and removesany possibility of a line setting` or platen-readjusting movementinterfering in any manner to cause inaccurate positioning of the sheetat the printing line by the platen-sweeping mechanism.

The line-space-wheel may be permanently secured to one member of theplaten-clutch, and through the operation of the clutch may render saidwheel operative or inoperative to drive the platen-shaft; theplaten-sweeping mechanism operates to drive a pinion through an angulardistance, the pinion being adjustably assembled to the line-space wheelto bring the teeth thereof into eective registry with the teeth of theline-space wheel, the adjusting means being effective to permanentlylocatesaid pinion and wheel in the proper adjusted positions, to enablethe pinion to become a driving element to ro` vtate the line-spacewheel, the platen-shaft and the platen. The driving inion is at alltimes in operative train wit the driving gear that is secured to atoothed one-way ratchet-.wheel engageable by a hand-driven pawl; thedriving pawl is mounted upon the sweep-actuating lever, and normally israised from the ratchet-teeth to permit of a free rotation of said wheelwhen the platen is rotated in any manner otherthan by the sweep-lever;the pawl is pivotally hung upon the sweep-lever and engageable with anadjustable back stop which is operative to determine the normal positionof the pawl relative to the teeth of the ratchet-wheel for the purposeof correcting any variations in the manufacture'and assembly of theparts, to insure an accurate initial engagement o the pawl with theteeth of the driving ratchf in the et-wheel; and the sweep-leveris-swingablc between an adjustable back stop and a tixedforward stop,the position of thev back stop being settable to an index-readingindicating a surface travel of tli'e platen necessary to carry awork-sheet from the rear of the platen to the first-line position fortyping. This combined platen-sweeping and line-correcting mechanism isaembled as a coniplete unit upon the platen-shaft, passes into inishedstock as a unit of manufacture, and is quickly assembled to atypewriting machine carriage as a unit instead of tieing up a machine atthe assemblers bench for hours while the separate parts are beingassembled piece by piece to the carriage-frame; and this assembled unitcan be transported and can readily be applied to machines in use by anyrepair man and without necessitating the removal of the machine from anoiiice to the repair shop.

Other features and advantages will hereinater appear.

In the accompanying drawing,

Figure 1 is a cross-sectional view showing the combined platen-sweep andplatenclutching mechanisms applied to the same end of the platen of anUnderwood typewriting machine.

Figure 2 is a cross-sectional view through the fulcrum-stud of theplaten-sweep handle.

Figure 3 is an end view of the typewritercarriage with the platen-clutchremoved at the plane of the line 3 3, Figure 1.

Figure 4 is a perspective view of the combined mechanisms, some of theplatensweeping mechanism being broken away and shown in section toillustrate the manner of maintaining some of the parts properly timed toeach other.

Figure 5 is a detail sectional view showing the manner of adjusting theline-spacing wheel relatively to the pinion driven by the platen-sweephandle.

The platen 10 is secured to the platenshaft 11 by screws 12 threadedthrough hubs 13 that locate the platen between carriageends 14 providedwith bearings 15 for the platen-shaft. Each end of the platen-shaft 11may be provided with linger-wheels 16 for manually rotating the platenin either direction, or the platen may be rotated forwardly by the usualline-spacing mechanism, disclosed in the patent to Cook, dated July 1,1913, No. 1,066,083, that operates to actuate a line-space wheel 17,usually secured to the platen-shaft 11. A detent-roller 18, urged by aspring 19, engages the teeth of the wheel 17 to determine a line-spaceposition on the platen.

The platen-shaft 11 extends leftward of the carriage-end 14 to carry aplaten-clutch 20, very similar to the construction shown patent toHelmond, dated August 17, 1915, No. 1,150,366, and shown attached to theend of the carria e. This Helmond clutch-mechanism inclu es afinger-button 21 secured to the ends of two rods 22 slidable through afinger-wheel 16 to actuate a cammember 23 slidableA along theplaten-shaft to expand clutch-arms 24 assembled upon the face of a disk25 secured to the latenshaft 11. The expansion of the clutc -arms 24provides for a gripping engagement with the inner peripheral face of adrum 26'and effectively causes both disk 25 and the drum to rotate withthe platen-shaft. The drum 26 ,includes a long sleeve-section 27 toprovide a free bearinfJr for the drum upon the platen-shaft, and theinner end of the sleeve L is secured to the line-space wheel 17, so thatboth wheel and drum will rotate together and rotate with the shaft 11when the platen clutch-members are in clutching engagement. The extralength of the sleeve 27 provides for the assembly of a pinion 28 and itshub 29 upon a shouldered-down section of the sleeve to prevent endmotion of the pinion though permitting the pinion to rotate upon thesleeve.

Preferably the pinion 28 and the linespace wheel have the same number ofteeth, though this is not essential. It is essential,

however, that provision be made whereby the pinion 28 may be adjustedaround the sleeve 27 so as to time the teeth of the pinion to the teethof the line-space wheel. One manner of accomplishing this adjustment isshown at Figure 5, where a section ofthe sleeve is straddle-milled toform flat faces 30 for the reception of a pair of set screws 31 threadedthrough the hub 29 of the pinion 28. It is apparent that the threadingin of one screw and the withdrawal of the other screw will cause aslight rotation of the pinion about the stationary sleeve l27, androtate the teeth of the pinion relatively to the teeth of the line-spacewheel 17, and

that when the 'adjustment of the pinion byone screw 31 is correct, theother screw may be threaded home and the joint effect' of both screws isto permanently lock the adjusted pinion to the sleeve.

The platen-sweeping mechanism is assembled within a framework includingan inner side frame 32 having a bent-over top section to form a foot 33that may be secured to the carriage-end 14 by screws 34 that wereformerly used to secure a cover-plate, and

an outer side frame 35, both side frames being secured together byspacing posts 36. Viewing Figure 3, it will be seen that the side frame35 terminates in a tail-piece 37, the free end of which is secured to ayoke 37a that passes under the sleeve 27 with the rear endoverlapping'the main body of the frame and both ends of the yoke securedto the frame by screws 38. This construction not only reinforces theframe but provides a means for adjusting the frame over and around thesleeve 27 of an assembled drum and line-space wheel.

The side frames 32 and 35 are further tied together by a stud 39 uponwhich are.

mounted the various rotating parts that cooperate to drive the pinion28. These parts include an arm or carrier 40 loosely mounted upon thestud 39 to 4bear against the inner face' of the side frame 35 with thefree end projecting above the frame and bent outwardly at right anglesto form a shelf 41 to overhang the frame. Between the shelf 41 and theedge of the frame 35 a dog 42 is pivotally hung upon a screw 43 threadedinto the carrier 40, and provided with a flat spring 44 bearing againstthe shelf 41 to throw the free end of the dog against the edge of theframe 35. The free end of the dog 42 is formed with teeth that areoperative to interlock with teeth 35 cut in the edge of the frame 35,said edge being concentric with the stud 39. The do 42 is formed with anear 45 by which the og may be lifted out of engagement with the teeth35a and the carrier 40 rotated about the stud 39 lin either directionand then locked in position through the re-engagement of the dog withthe teeth 35a for purposes presently to appear.

1A sweep-lever 46, having a handle 47, is assembled upon the stud 39 tobear a ainst the face of the carrier 40 and provider? with Ta hub orsleeve 48 that extends over the 49 being in train with the pinion 28.The

space upon the sleeve 48a between the gear 49 and the frame 32 is filledby amdisk 5() having a peripheral grooveto seat a long spiral spring 51having one end attached to ya` set screw 52 that secures the disk to thesleeve 48, and the other end thereof anchored to a pin 53 in the sideframe 32.

The descri tion up to this point permits of the lever being swungforwardly to rotate upon the stud 39 and rotate the disk 50 to expandthe spring 51, and upon the release of the handle 47 said spring 51 willrestore the lever 46 to a normal position against a back stop. This backstop takes the form of a stud 54 secured tothe end of an arm 55pivotally mounted upon a screw 56 threaded into an extension 57 of thearm 40. To render the back stop position of the lever adjustableforpurposes of timing the engagement of a pawl With a toot-h of theratchet-wheel, the extension 57 is formed with an ear 58 to support astopscrew and check-nut 59, the'screw bearing against the stud 54. Toconvey motion from the lever 46 to the ratchet-wheel 48, a pawl 60 maybe pivoted at the side of the lever 46 to overhang the ratchet-teeth, asupon a screw 61, and spring-pressed in the direction of the teeth by aspr' 62 between the vpawl and a pin 63 on t e lever 46. The

' 58a is provided and is attached to the ear 58 and plays over anarcuate scale 58" secured to the side frame 32, asvshown in Figure 1. Y

It will be understood that the carrier 40 is first positioned relativelyto the frame side 35 to position the back-stop stud 54 and determine thenormal position of the lever 46 according to the extent of rotationrequired by the platen to present a work-sheet to the printing line;that the initial forward movement of the lever 46, away from the stopstud 54, releases the pawl to the action of its spring 62 whichvibrates-said pawl into engagement with the ratchet 48; that thecontinuation of the forward movement of the lever 46 rotates the gear 49which in turn causes a reverse rotation of the platen until theforward-sweep of the lever brings thepawl 60 under the post 36 when thepawl becomes wedged between said post and ratchet-wheel 48, whicharrests the lever and prevents overthrow of the platen and parts; thatwhen the lever 46 has reached the end of its forward strokev and theplaten movement has ceased, the parts are so adjusted and timed thatlthe detentroller 18 will accuratelynest between two adjoining teeth ofthe line-space wheel 17; that should the platen-clutch be released forany purpose in the midst of a typing operation, when the clutch isrestored and the platen rotated by the lever 46, vthe unitaryconstruction of the line-space wheel and the pinion prevents any.disarrangement in the timing of the parts to the line-space detentroller18; that the several parts may be assembled upon a platen-shaft andwithin the two frame sides and become an assembled unit of manufacture;and that this unit assembled by experts in the art may be shipped todistant locations and assembled to a machine by unskilled hands.

It will be further noted that the platensweeping device includes threeco-operating mechanisms, viz.,a laten-clutch mechanism,

` printed upon a web and rolled up or fanfolded at weakened lines whichseparate the checks. The first check is inserted to the first line to betyped thereon, which usually is a date-line, and should this printedlineposition not correctly align with the usual Underwood line-finder,the laten-clutch is released and then restored a r the line-position iscorrected in the usual manner. After the date-line is typed the check islinespaced to the position for typing the payees vname and againline-spaced to the amountline where the typing of the amount completesthe typing of the check, the line-spacing of the platen idly rotatingthe pinion 28,

gear 49 and its ratchet 48. The platensweep mechanism having beenpreviously adjusted to the work at hand, the forward stroke of thesweep-handle 47 removes the completed check and correctly advances thenext blank check to the date-line.

The forward feeding of the checks is limited by the fixed stop 36, andthe handle 47,

when released, is restored to normal position against a stop 54 by thespring 51, while the platen, line-space wheel and ratchetwheel 48areheld stationary by the detentroller 18. In work of this character theline-space mechanism and platen-sweep mechanism are both employed tofeed the work-sheet forwardly, but in other classes of work, as, forexample, in typin a single line on invoices that are printe in' webform,the platen-sweep lever is the only form of work-sheet-feeding employed.

The placing of the platen-sweep lever at the same end of the carriageasthe linespace lever enables the operator to execute both forms ofplaten-feed with the same hand, which is an advantage.

Variations may be resorted to within the scope of the invention, andportions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, in' combination with a platen having anaxle, a linespace mechanism therefor including a ratchet-wheel, and aclutch normally connecting said line-space mechanism with said platen,said ratchet-wheel being rigidlymounted on s' spacing sleeve of saidclutcha platenfthe platen-sweep mechanism being directl sweep forrotating the platen through a pre'- determined distance greater `than a11nespace, including a manually-driven element and a gear-wheel rigidtherewith and mounted eccentrically of the laten-axle, and a pinion inmesh with sai gear-wheel and adjustably fixed upon lthe sleeve andbetween vthe clutch and said ratchet-wheel for driving the platen.

2. In a typewriting machine having a rotatable laten, the combination ofa linespace ratc et wheel and a hub therefor, a pinion on the hubnormally rigid'therewith, platen-sweep mechanism and platen-clutchmechanism connected directly and adjustably to said hub, the line-spaceratchet wheelbein effective through the hub and the clutc -mechanism torotate the platen, and

connected to the pinion, the hub, and throng the hub to theclutch-mechanism to positively rotate the platen in a fixed directionand the laten when unclutched being rotatable indpendently of both theline-space mechanism and the sweep mechanism,

3. In a typewriting machine having a carriage and a rotatable platen,the combination of a line-space mechanism having a toothed wheel, a huband a pinion on the hub, a platen-clutch mechanism and a platen-sweepmechanism, all arranged for co-operation at one end of the platen andexteriorly of the platen, the line-space mechanism being effectivethrough the clutch-mechanism to rotate the platen in a line-spacedirection, the platen-sweep mechanism including a'movement-multiplyingtrain of gears operatively connected to rotate the pinion andclutchmechanism, a one-way ratchet-wheel to rotate the train of ears, amanual sweep-lever, a pawl on said ever and engageable with theratchet-wheel, and two stops to determine the extent of sweep for saidlever, one sto operable to check the forward sweep of sai lever at apermanent position, and the other stop movable about the axis of thelever to adjustably fix a normal back-stop position for the sweep-lever,the angular pitch of the teeth of the line-Space wheel eing greater thanthe pitch of the ratchetwheel teeth, in proportion to the differencein'speed of said wheels.

4. In a typewriting machine having a rotatable platen and aplaten-shaft, the combination of means for driving the platenshaft torotate the platen to 1nsert a long work-sheetto a typing line, saidplaten-rotating means including two clutch-members, one member securedto the shaft and the other member loose upon the shaft and formed with asleeve, manual means for bringing both clutch-members into clutchingengagement to cause the sleeve to drive the platen-shaft, a line-spacewheel permanently secured to said sleeve to rotate the shaft and platenline-space distances, a pinion secured to the sleeve, and amanually-rotated gear germanentlly in train with the pinion to rive thes eeved clutch-member and rotate the platen through distances greaterthan a line-s ace.

5. n a typewriting machine having a laten rotatable by a platen-shaft,the comination of means for driving the platenshaft to rotate the platenfor inserting a work-sheet having a long heading, said platen-rotatingmeans including two clutch- -\`members, one member secured to the shaftand e other member loose upon the shaft and formed with a sleeve, manualmeans for bringing both clutch-members into clutching engagement tocause the sleeve to drive the platen-shaft, a line-space wheel permanenty secured to said sleeve to rotate the platen line-space distances, apinion on the sleeve, screws carried by the pinion and engageable withthe sleeve to minutely adjust the sleeve and the pinion to each other, a

manually driven gear permanently in train with the pinion to drive thesleeved clutchmember to rotate the platen through distances greater thana line-space, and a sweep lever to drivethe gear.

6. In a typewriting machine having a platen rotatable by a platen-shaft,the combination of means for driving the platenshaft to rotate theplaten for inserting a work-sheet having a long heading, saidplaten-rotating means including two clutchmembers, one member secured tothe shaft and the other member loose upon the shaft and forme with asleeve, manual means'for brlnging both clutch-members into clutchingengagement to cause the sleeve to drive the platen-shaft,a line-spacewheel permanently s ecured to said sleeve to rotate the platen hne spacedistances, a pinion, means for minutely adjusting the plnion upon thesleeve, a gear always in train with the pinion, a ratchet-toothed wheelsecured to the gear, a sweep-lever, a pawl upon said lever operative toengage the ratchet wheel for a oneway drive to rotate the platen throughan arc greater than a line-space, and a spring to restore said lever anddisengage the pawl while the platen is stationary.

7. In a typewriting machine having a. rotatable platen and aplaten-shaft, the combination of means for driving the platenshaft torotate the platen and insert a long heading of a work-sheet to thetyping line, said platen-rotating means including clutchmembers, onemember secured to the shaft I wheel permanently secured to said sleeve,a

pinion mounted upon the sleeve, -a larger gear always in train with theinion, a ratchet-toothed wheel secured to t e gear, a sweep-lever, apawl upon said lever engageable with the ratchet wheel for a one-waydrive to rotate the pinion, and a .pair of stops to determine the extentof sweep for said lever, both stops engageable with the pawl, theangular pitch of the teeth of the line-space wheel being greater than'the pitch of the ratchet-Wheel teeth, in proportion to the difference inspeed of said wheels.

8. In a *typewriting machine having a platen rotatable by aplaten-shaft, the combination of a line-spacing mechanism having aline-space Wheel rotatable about the platen-shaft, clutch-membersoperative to connect the line-space wheel to the platenshaft, a pinionrotatable with the line-space wheel, a gear in train with the pinion,asweep-lever operative to drive the gear to rotate the pinion and drivethe platen, and a pinion rotatingv and pinion-ho ding screw for'minutelyaligning the teeth of the pinion relatively to the teeth o theline-space wheel to prevent displacement of the teeth when the platen isreleased from the clutchmembers.

9. In a typewriting machine having a carriage and a-rotatable platen,the combination of a line-space ratchet wheel, aV

platen-sweep mechanism, including a lever and a single platen-clutchdevice having a hub, a pinion normally rigid therewith and all arrangedfor co-operation at one end of the platen and exteriorly of the platen,the sweep-lever being ivoted eccentrically of the platen, means ortransmitting motion from said lever to said platen through said hub andpinion, and adjustable means for correcting the relation between saidpinion and said line-s ace ratchet wheel to preserve their timed reation.

10. In a typewritin machine, the combination of a rotative .p aten, aratchet-wheel for rotating theplaten, a crank, means for automaticallyestablishing a rotary connection between said crank and theratchetwheel, a fixed sto to arrest the forward sweep of the cra anadjustable carrier, a back stop on the carrier settable with the carrierfor an ap roximate initial position for the crank, an adjustable meanson the carrier efective to shift the back stop relatively to the carrierfor a ne adjustment of the back-stop position to arrest the crank.

11. In -a typewriting machine, the combination of a rotative platen, aratchet-wheel for rotating the platen, a crank, means for automaticallytablishing a rotary connection between said crank and the ratchetwheel,a fixed sto. to arrest the forward sweep of the cran an adjustablecarrier, a back stop on the carrier settable with the carrier for anapproximate initial position for the crank, and adjustable means-on thecarrier eiective to shift the back stop relatively to the carrier for afine adjustment of theback-stop position to arrest the crank, saidadjustable means includin a screw operable to minutely shift the baclistop and a clutch-nut to hold the adjusted position of the screwrelatively to the carrier.

12. In a typewriting machine, the combination of a rotative platen, acrank for turning the platen, means for automatically establishing anoperative connection and disconnection between the crank and the platenby the movement of the crank, spring-means for restoring the crank toits initial position independently of the platen, and two stop-devicesfor arrestin the crank, one stop-device having a umformly fixed forwardstop position for the crank, and the other stop-device being settableline-space distances for a back-sto position of the crank, said backstop being independently adjustable to intermediately line-spacedistances to minutely determine the stroke of the crank for apredetermined platensweep.

13. In a typewriting machine having a carriage and a shaft-drivenplaten, the combination of a platen-clutch mechanism having a sleeve andclutchable drum and a linespace mechanism having a line-space wheel,both -wheel and drum permanently connected by the sleeve to rotatefreely as a unit on the shaft -exteriorly of the platen ybut to drivethe platen when the clutchmechanism is effective, and a work-insertingplaten-sweep mechanism including a hand-lever mounted on the carriage,said hand-lever having motion-multiplying connections including a gearand a pinion on said sleeve, to drive said nit and rotate theplaten,said inion being fixed upon the sleeve between the line-spacewheel and the drum.

14. In a typewriting machine having a carriage and a shaft-drivenplaten,-the combination of a platen-clutch mechanism having a clutchabledrum and a line-space mechanism having a line-space wheel, both wheeland drum permanently -connected by a sleeve as a unit to rotate freelyon the shaft exteriorly of the platen but to drive the platen when theclutch-mechanism is effective, a work-inserting platen-sweep mechanismincluding a hand-lever mounted on the carriage, said hand-lever havingmotion-multiplying connections to drive said unit and rotate the platena distance greater than a line-space including a gear and a drivenpinion, said wheel and said vdrum being spaced apart to provide apermanent ico assembly of the pinion u on the sleeve, and

threaded means to roc ably adjust said pinion upon said sleeve topermanently time the sweep-mechanism with mechanism.

l5. In a typewriting machine, the combination with a rotative platen, aline-s ace wheel and a clutch connectible to the Enespace wheel torotatefthe platen, of a platendriving mechanism 'for sweeping the platenfor positioning a long work-sheet at the printing line of the platen atone stroke, said sweeping mechanism including a stationary stud parallelwith the platen, a sweep-lever having a long bearing hub mountedupon'the stud, a tatable upon the hub, a driving gear rotatable with theratchet-wheel, a lever-restoring rotary spring-carrier fixed upon thehub and which prevents lateral displacement of the ratchet-wheel andgear upon the hub, a carrier on the stud having a stop, a pawl mountedon the sweep-lever and having an interrupted connection with theratchetwheel through engagement with the stop and a pinion permanentlyrotatable with the line-space wheel and permanently in the line-spacetrain with the ratchet-driven gear.

16. In a typewriting machine, the comratchet-wheel rowheel bination witha rotative platen, a line-space wheel and a platen-clutch mounted uponthe platen-shaft exteriorly of the platen to rotate the platen, of aspacing sleeve securing both the line-space wheel and the platenclutchas a spaced-apart permanently assembled unit, and a platen-drivingmechanism for sweeping the platen at a single stroke and positioning along work-sheet heading at the printing line of the platen, saidsweeping mechanism including a sweeplever having a long bearing hub, aratchetrotatable upon the hub, a gear rotatable with the ratchet-wheel,a lever-restoring rotaryspring-carrier fixed upon the hub to preventlateral displacement of both ratchet-wheel and gear upon the hub, acarrier having a stop, a, pawl mounted upon the sweep-lever and havingan interrupted connection with the ratchet-wheel through engagement withthe stop, and a pinion mounted upon said spacing sleeve between theline-space wheel and the clutch and permanently in train with theratchet-driven gear.

ALFRED G. F. KUROWSKI.

